Note: both those games are slashers and if you're more interested in levelling up and gore than story, immersiveness and beauty of gameplay - then go ahead and buy those.

back to planescape

#1 the story and immersiveness is beautiful.
a side effect of rpgs is going back to the world with the sense of 'where the heck did the last two weeks of my life go?'
and feeling a strange sense of regret.
well with Planescape - nah, there's no regret - none whatsoever.

#2 beautiful art work and graphics
the level of detail is painfully nad lovingly done. the sheer beauty hits at you.

#3 awesome gameplay and quests
there is an incredible amount of variety and a few amazing features
- change your character from thief to mage to warrior anytime
- really really well developed companions
- the brothel of slating intellectual lusts
- never die

this game is incredible - one of the things you must do before you die provided you're an rpg fan